Respirator grill ribs



FIG. 1 is a front perspective view showing the new design for respirator grill ribs.

FIG. 2 is a left view thereof;

FIG. 3 is a right view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a back view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

Broken lines form no part of the claimed design, and any shading is provided to illustrate contour only and is not an indication of texture, gloss, etc. 

CLAIM The ornamental design for respirator grill ribs, as shown and described. 